<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<!-- <style>
    * {
        margin: 0;
        padding: 0;
    }

    .wrap {
        width: 600px;
        height: 600px;
        background-color: red;
        position: absolute;
        left: 0;
        top: 0;
        right: 0;
        bottom: 0;
        margin: auto;
    }

    .inner {
        width: 400px;
        height: 400px;
        background-color: yellow;
        position: absolute;
        left: 0;
        top: 0;
        right: 0;
        bottom: 0;
        margin: auto;
    }

    .box {
        width: 200px;
        height: 200px;
        background-color: pink;
        position: absolute;
        left: 0;
        top: 0;
        right: 0;
        bottom: 0;
        margin: auto;
    }
</style> -->
<link rel="stylesheet" href="../less/css/index.css">

<body>
    <div class="wrap">
        <div class="inner">
            <div class="box"></div>
        </div>
    </div>
    <div class="box-wrap"></div>
</body>

</html>